Tobacco pipe



Nov. 24, 1936.

E. VOLLMANN TOBACCO PIPE Filed Oct. 4, 1935 \NVENTOR V0 a. L. MA N NEDUARD B; W BMVL ATTORNEY Patented Nov. 24, 1936 UNITED STATES PATENTOFFICE Application October 4, 1935 ,'Serial No. 43,606

In Germany April 23, 1934' a 1 Claim.

This invention relates to tobacco pipes of the kind comprising an outerbowl in which is positioned an inner bowl to receive the tobacco and hasmore particular reference to pipes of this kind in which the inner bowlis open-ended and the tobacco is supported on a protuberance projectingfrom the base of the outer bowl into the open end of the inner bowl.

The object of the present invention is to provide a pipe of thischaracter which will burn well even when tightly filled with finely cuttobacco and at the same time to cool the smoke without the occurence ofmoist depositions in the bowl of the pipe itself.

With this object in view, according to the invention the inner bowl andthe outer bowl together with its projection are so dimensioned andarranged that an annular gap of constant cross section is formed betweenthe projection and the lower end of the inner bowl and a further narrowannular cavity is formed between the inner bowl and the inner wall ofthe outer bowl of the pipe so that the smoke passes through the firstannular gap and about the lower edge of the inner bowl to the secondannular gap from whence a channel leads to the mouth piece of the pipe.

One embodiment of the invention is shown by way of example in theaccompanying drawing, in which:

Fig. 1 shows a vertical longitudinal section,

Fig. 2, a horizontal section along the line AB of Fig. 1,

Figs. 3 and 4, central sections through the outer bowl of the pipe andthrough the removable open ended inner bowl respectively.

The open ended inner bowl b is introduced into the outer bowl a of thepipe in such manner that its lower end embraces the cylindricalprojection c at the bottom of the outer bowl of the pipe and leaves asmall annular gap of uniform width between the inner wall of the innerbowl and the periphery of the projection. At the top, the inner bowl bhas a conically widening portion or disposed beneath the outer marginalrim 6 and the conical portion fits in a corresponding taper in the outerbowl a of the pipe. With this mode of securing the inner bowl b to theouter bowl a, the cross section of the annular gap through which smokeis drawn oif is not affected even by wear of the parts which rest oneach other, but remains constant. The depression g in the bottom of theouter bowl of the pipe is so deep that there is plenty of room for thelower edge of the inner bowl b, i. e. an adequate passage is affordedfor the tobacco smoke.

The smoke is drawn in the usual way through a mouth piece h which isinserted in the socket i of the outer bowl o The other end of the mouthpiece may be circular or of flattened cross-section as indicated in Fig.2. A smoke passage is leads from the highest point of the cavity of thesocket i for the mouth piece it upwardly to close beneath the seatingfor the conical portion cl of the open ended inner bowl b and thereterminates in the narrow annular gap between the inner bowl b and theouter bowl a.

To obtain an equalization of pressure and uniform distribution of thesmoke, an annular groove Z is provided immediately in front of the pointwhere the smoke passes into the smoke conduit is. In the drawing thegroove 1 is shown as provided in the inner wall of the outer bowl 0. butit could equally well be provided in the outer wall of the inner bowl b.

The annular groove 9 in the base of the outer bowl u; of the pipe hasthe same efiect in respect of equalization of pressure and smokedistribution in the narrow annular channel between the inner bowl I) andthe projection c as does the annular groove 1 with respect to the narrowannular cavity between the inner bowl b and the inner wall of the outerbowl a.

The annular cavities between the inner bowl b and the projection c onthe one hand and the outer bowl a on the other hand are so narrow as toprevent the passage of particles and ash which otherwise in conjunctionwith the liquid depositions from the smoke would cause undesiredcontamination in passing through the bowl and the smoke passages, thusgiving rise to an unpleasant odour and unpleasant taste. The narrownessof the annular gap between the inner bowl b and the inner wall of theouter bowl a also affords the advantage that the smoke forms a thinsheath which on passing through the annular cavity is subjected to acorresponding cooling which, however, cannot cause appreciable liquiddepositions from the smoke in the bowl itself. It is only in the furtherpassage of the smoke to the mouth piece that deposition occurs.- Thesocket i is provided with a cavity materially larger than the end of themouthpiece which is introduced into the socket. As seen from thedrawing, this results in a chamber in which any depositions can collect.After removing the mouthpiece the matter collecting in this chamber canreadily be removed.

After removing the inner bowl b and the mouth piece h the pipe can becleaned very thoroughly, rapidly and effectively as is readily apparentfrom the representation of the individual components in Figs. 3 and 4.

I claim:

In a smoking pipe comprising a cylindrical outer bowl provided with amouthpiece receiving socket and a mouthpiece positioned in said socket,an upstanding projection positioned centrally Within said bowl, an innertobacco receiving bowl having an opening in its bottom of a diameterslightly larger than the external diameter of said projection, the lowerportion of said inner bowl having cylindrical external configuration ofa diameter slightly less than the interior diameter of the outer bowl,an outwardly projecting flange at the upper periphery of said innerbowl, 2, frusto-conical shoulder formed on the exterior of said innerbowl between said lower cylindrical portion and said peripheral flangeadapted to engage a tapered annular surface provided within the outerbowl adjacent the upper edge thereof when the bowls are nested tomaintain the lower cylindrical portion of the inner bowl slightly spacedfrom the outer bowl and to maintain the opening in the bottom of theinner bowl spaced from said projection, the bottom of said inner bowlbeing spaced from the bottom of the outer bowl to provide an annularpassage therebetween, one of said bowls having an annular groove formedin the side thereof immediately below the frusto-conical shoulder toprovide a smoke equalizing chamber, and a duct connecting said chamberwith the mouthpiece 7 socket.

EDUARD VOLLMANN.

